fuel tank in my 1983 300d collapsed ,, i used some tank sealer to hopefully stop the leak that was created(small crack where the tank bent in) so far no leak...all due to vent line totally blocked...still a very little woosh sound when i remove fuel cap...supposed to be like this? tried searching forums...thanks again everyone...clean your vent line!!!

wow im going to actually unclog mine this weekend, no more putting that one off

__________________
http://i106.photobucket.com/albums/m...73378_30-1.jpg

Sounds like you have a very good lift pump!!
I didn't know the tank would collapse like that.....

__________________
Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John

crazy!!! supposed to be a slight release of air when removing cap?...way better now than used to be but now i'm on the paranoid side

Note that I've driven the same model for 25 years.
Never heard a whoosh sound when removing fuel cap.

__________________
Charles
1983 300D, bought new, 215k+ miles, donated to Purple Hearts veterans charity but I have parts for sale: http://www.peachparts.com/shopforum/mercedes-benz-cars-sale/296386-fs-1-owner-83-mb-300d-turbo-rebuild-parts.html

Any airflow sound means the breather is still restricted. The tank should have less than 1psi pressure or 1"Hg vacuum if the breather and tank cap are working correctly. If you have the plain engine oil style cap you should get the correct cap made for the fuel tank that has a pressure relief vent built in.

Oil:


Fuel:

Seems strange mercedes would even have the vent under the car where it is. think it would be up higher.

My 82 Datsun Diesel PU, they run the vent line along the supply and return line into the engine compartment. the vent line then runs across the fire wall over to the pass side and bends down.

The only problem I had with it was a check valve at the fuel tank.
when I would open the fuel cap it would WHOOOSH.
removed the check valve and everything has been normal.

on the MB I have taken the end piece off the vent line and cleaned it a couple yrs ago. just checking things, and to see what it was.
seems like it would pick up dust and dirt as the tank draws in air.

thats my vent on things .

Charlie

__________________
there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works

Are you sure those are not just early and late styles? The Oil caps say 'Oel' on them. My fuel cap looks like the first one and has a mercedes star on it.

__________________
1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine

Yeah, the tank cap on all of our cars looks like the upper picture, and they all have a star on them, and seem to work fine. My dad's SD had a whooshing problem, but we cleared out the tank vent and it solved the issue...

__________________
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

From the cd shop manual for 602/603 , section 47-0030. With normal system operation pressure of up to 50mb can be developed in the tank.The pressure part of the vent valve should open between 30-50mb.Should the vent valve fail to open the fuel tank cap will release the pressure if it reaches 100mb.The vacuum valve of the vent should open at 1-16 mb of vacuum. So a pretty good "woosh" when you remove the cap is not an indication of a problem. Don

__________________
Red Green "This is only temporary,Unless it works!"

97 E300D 157000 miles
87 300TD ?141k? miles

same here with the top pic, my Fuel cap looks like the top one. Is that lower one a upgrade or newer model that may have came on newer models.

__________________
http://i148.photobucket.com/albums/s...titled-1-3.jpg
1981 300d